Gm Global Technolgoy Operations, Inc.

Barry L Priem

Dale A Gerard

Mark A Osborne

Gary C Ward

Edward C Wall

Kenneth George Stahl, Jr

Allen T Birschbach

Robert Alfred Stork

A rotor for an induction motor and a method of preparing same. The method includes making a squirrel-cage rotor made up of a cage and a laminate stack by forming a mold around the stack, heating the stack and introducing a molten metal into the mold such that the molten metal substantially fills a space defined in the stack that corresponds to the cage. In one form, the space includes slots or related channels formed in the stack that upon filling with the molten metal become longitudinal bars that form electric current loops with end rings of the cage. By heating the stack and maintaining it at a temperature high enough to keep the molten metal in a substantially molten state at least long enough for it to flow through the slots of the stack, premature freezing of the molten metal is avoided. In addition, by providing low pressure to the molten metal in conjunction with the elevated temperature in the stack, flow is promoted to ensure a substantially porosity-free, fully dense squirrel-cage for the rotor.

Pressure casting of electric rotors

A filtration and float apparatus and method are disclosed, wherein an integrated float frame and filter is provided, a buoyancy of the float frame and filter causing a sealing of the filtration and float apparatus with a pump.

Integral filter and float for an electromagnetic pump

A method and apparatus for controlling the dispersion of molten metal in a mold cavity is disclosed, the control facilitated by a localized densification of foam in a lost foam casting operation for producing metal castings, wherein the filling of regions of the mold cavity which do not lend themselves to castability is maximized, an amount of backfill and casting defects are minimized, and a flow pattern of molten metal and material properties of the resulting casting are optimized.

Method and apparatus for controlling dispersion of molten metal in a mold cavity

A method for preparing engine block cylinder bore liners is disclosed, the method including preconditioning of the cylinder bore liners for use in sand casting of engine cylinder blocks, wherein an efficiency of the preconditioning process is maximized, a metal pour temperature is minimized, and material properties of the casting are optimized.

Method for preparing engine block cylinder bore liners

A gas removal system for a mold cavity of a die casting or other molding machine includes a vacuum line connecting the mold cavity to a vacuum pump when a valve therebetween is open to evacuate gas from the mold cavity prior to injection of molten material therein and further includes a gas flow indicator disposed in the vacuum line between the valve and vacuum pump. The gas flow indicator includes a mechanical flapper movable in a particular manner in response to evacuation of gases from the mold cavity and in another noticeably different manner when little or no gas is evacuated from the mold cavity as a result of the valve being improperly closed. The flapper is visible to a machine operator through a window to indicate whether the gas evacuation system is operative to remove gas from the mold cavity.

Mold cavity gas removal system with gas flow indicator

A gas removal system for a mold cavity of a die casting or other molding machine includes a valve movable to an open position to interconnect the mold cavity to a gas venting or evacuating device or to a closed position. A portion of the valve is movable relative to a fluid pressure supply inlet port to establish a first pressure condition represented by back pressure in the supply line when the valve is in one of the open or closed positions and a second pressure condition represented by substantial absence of back pressure in the supply line when the valve is in the other of those positions. The presence or absence of back pressure in the supply line is sensed to determine valve position. A control unit compares the second valve position and a scheduled valve position and indicates when the valve is improperly positioned to prevent injection of a melt into the mold cavity.

Growing community of inventors

Saginaw, MI, United States of America

Barry L Priem